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the first time block 0 is read. This fix initialises the block numbers to -1 which isn't the most correct thing for a daddr_t but it isn't likely to cause a problem in the boot blocks and it could do with a more thought out fix later. The bug is probably benign on the i386 but on the alpha it can cause initial file opens to fail. This is the cause of the "can't open /boot/boot.conf" errors. It appears on the alpha because of a number of combining factors. On the alpha the LABELSECTOR is 0 so block 0 needs to be read in from the media. The first time this happens you get a false hit because the bc_blkno field is zero initially. Also, the timestamp check against this cache hit succeeds because on the alpha a hacked getsecs() function can return 0 when it starts counting so that the zero initial timestamp + BCACHE_TIMEOUT is greater than the current time until getsecs() has counted passed BCACHE_TIMEOUT. The overall effect is that the first open() that occurs gets a false cache hit and returns garbage to the bd_strategy() function which then fails the open() call. This false hit then stays in the cache until BCACHE_TIMEOUT getsecs() ticks have passed; all open() calls during this time fail. This explains why you can generally access the media by the time you get to interp() and start issuing commands but the earlier attempts to run the boot scripts are failing. It's possible that this is causing the problem switching to the mfsroot floppy as well but I haven't confirmed that.
This is the top level of the FreeBSD source directory. This file was last revised on: $Id: README,v 1.12 1998/06/30 08:08:05 jkh Exp $ For copyright information, please see the file COPYRIGHT in this directory (additional copyright information also exists for some sources in this tree - please see the specific source directories for more information). The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree, the most commonly used one being ``world'', which rebuilds and installs everything in the FreeBSD system from the source tree except the kernel and the contents of /etc. Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags. Building a kernel with config(8) is a somewhat more involved process, documentation for which can be found at: http://www.freebsd.org/handbook/kernelconfig.html And in the config(8) man page. The sample kernel configuration files reside in the sys/i386/conf sub-directory (assuming that you've installed the kernel sources), the file named GENERIC being the one used to build your initial installation kernel. The file LINT contains entries for all possible devices, not just those commonly used, and is meant more as a general reference than an actual kernel configuration file (a kernel built from it wouldn't even run). Source Roadmap: --------------- bin System/User commands. contrib Packages contributed by 3rd parties. crypto Export controlled stuff (see crypto/README). etc Template files for /etc games Amusements. gnu Various commands and libraries under the GNU Public License. Please see gnu/COPYING* for more information. include System include files. kerberosIV Kerberos package. lib System libraries. libexec System daemons. lkm Loadable Kernel Modules. release Release building Makefile & associated tools. sbin System commands. secure DES and DES-related utilities - NOT FOR EXPORT! share Shared resources. sys Kernel sources. tools Utilities for regression testing and miscellaneous tasks. usr.bin User commands. usr.sbin System administration commands. For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see: http://www.freebsd.org/handbook/synching.html